Formula: Pb6Bi8(S,Se)18
Reflected/transmitted colour: RL white
Pleochroism: RL weak
Optical isotropy/anisotropy: RL strong, dark gray red-brown
Optical sign:
Refractive indices:
Bireflectance/Birefringence δ:
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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